Finalize AUX Extension.
Now we can support up to 8 channels.
For that the variabels auxstate and cfg.activate[] is changed to
uint32_t

In case of cfg.auxChannels > 4 MSP_BOX and MSP_SET_BOX uns 32bit for
each item. If cfg.auxChannel <= 4 the howl code work as before.

The only GUI to handle this new feature is BaseflightGUI (Sorry Windows only):
http://www.klick-punkte.info/download/BaseflightGUI2.zip

Signed-off-by: cGiesen <info@klick-punkte.info>